Their isn’t one way to make a flat head screwdriver. Some a chisel and some are slots. The slotted ones are better but more expensive.
Both still slip from the screw and are a pain to manually screw (slotted less so).
Pozi is the best + type screw. It’s pretty much standard for UK construction. The only time a different type is used is sometimes Phillips for plaster board or external hex and internal torx for long or large screws.
They couldn’t argue it was the Uncles responsibility to tell the child. The Uncle was told, and would also have been told to not tell the child. They set out to make the child believe they got the PlayStation because they wanted the reaction from the child.